Do I have to make a new database for each wordpress install if making lots of blogs?

I am about to make a cluster of self hosted wordpress blogs for energizer. Wordpress is telling me I don't have to have new databases for each but when I just went and logged in it took me to the 1st blog I made.

I want to make 10+ blogs so should I make a new database for each or is it easier to do it some other way?

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